Composite Sprinkler Head Mold Fiber Orientation Control
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Solution Overview
Problem
Existing automatic sprinkler systems face challenges in manufacturing cost-effective and reliable sprinkler heads that can withstand the demands of fire-fighting equipment.
Innovation Solution
The development of a mold and method for manufacturing a polymeric sprinkler head part using a composite material consisting of a thermoplastic polymeric resin and reinforcing fibers, with a specific injection molding process that controls fiber orientation and knit line placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal components are used for sprinkler heads, then strength and reliability are improved, but manufacturing cost increases
Solution Approach 1:
The patent employs composite materials consisting of thermoplastic polymeric resin and reinforcing fibers (such as glass, carbon, or aramid fibers) to manufacture sprinkler head components. This composite approach provides strength comparable to metal while reducing manufacturing cost and enabling integration of multiple parts into single molded components, thereby resolving the contradiction between reliability and manufacturing cost.
2Ease of manufacture
If multiple separate metal parts are assembled, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple separate sprinkler head components into single integrated parts through injection molding of composite materials. For example, the sprinkler head body, frame arms, and cross members are formed as single molded pieces rather than assembled from multiple metal parts, reducing device complexity while maintaining ease of manufacture.
3Productivity
If fiber orientation is not controlled during injection, then manufacturing precision is worsened, but productivity is improved
Solution Approach 1:
The patent controls fiber orientation by adjusting injection molding parameters such as injection speed, pressure, and flow direction. The mold design incorporates specific gate locations and flow paths that guide molten composite material to achieve desired fiber alignment in critical areas, thereby maintaining both productivity and manufacturing precision.
4Manufacturing precision
If knit lines are present in critical areas, then manufacturing precision is improved, but reliability is worsened
Solution Approach 1:
The patent applies local quality control by strategically positioning knit lines in non-critical areas of the sprinkler head components while ensuring critical load-bearing areas remain free of knit lines. The mold design and injection parameters are optimized to direct material flow such that knit lines form in areas that do not compromise structural integrity, thereby maintaining both manufacturing precision and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a cost-effective and reliable sprinkler head part with enhanced mechanical properties, such as high tensile and compressive strength, and improved thermal stability, while eliminating knit lines in critical areas.
Implementation Method 1
injecting a composite material in molten form into the mold to form a molded product
Data Source
AI summary
An injection mold for producing a sprinkler head part and related injection molding methods are described. The sprinkler head part includes a first, second, third and fourth mold portions. The first and second mold portions include first and second shaping elements structured to cooperatively form a body including a substantially cylindrical portion and a substantially planar portion, and two frame arms extending from the substantially planar portion of the body. The third mold portion includes a shaping element structured to form an orifice in the body of the sprinkler head. The fourth mold portion includes a shaping element structured to form a cross member connecting the two frame arms. The injection methods include injecting a composite material in molten form into the mold to form the molded sprinkler head part. The composite material includes thermoplastic polymeric resin and a plurality of reinforcing fibers dispersed in the resin.